first filter
If bolstering your time magic doesn't work and neither does Rhysh's forward magic, a couple of the other suggestions that haven't been tried yet are: manifesting the contract into a physical object and then destroying it or even taking the contract to court here in Vallo to get it contested.
I know a soul exchange was also suggested. And soul cleansing I think was the other one that Wei Wuxian said?
And Lizzie was thinking of a suppression or purification spell. IDK if that one has been attempted or not.